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Article: Degraded prism sheaths in the transition region of hypomineralized teeth

TitleDegraded prism sheaths in the transition region of hypomineralized teeth
Authors
KeywordsEnamel
Hypomineralization
Nanoindentation
Transmission electron microscopy
Issue Date2010
PublisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/jdent
Citation
Journal Of Dentistry, 2010, v. 38 n. 3, p. 237-244 How to Cite?
AbstractObjectives: Failure of the enamel adjacent to the defects in teeth with molar incisor hypomineralization (MIH) limits the success rate of the restorations placed in these teeth and this frequently leads to their ultimate extraction. To understand the cause, a state-of-the-art combination of focused ion beam (FIB) and nanoindentation techniques was used to evaluate the fracture properties and microstructure of enamel from specific regions of two MIH teeth. Methods: Nanoindentation, bend tests on micro-cantilevers and transmission electron microscopy (TEM) were employed to compare the microstructure and mechanical properties of the unaffected, opaque and transitional region in two MIH teeth. Special attention was paid to the transitional region in all the experiments in an attempt to identify its role in affecting the overall integrity of the MIH teeth. Results: The enamel in the transitional region, despite its translucent appearance under the naked eye, was found, under TEM, to have prism sheaths that were significantly less mineralized than unaffected enamel and were proved to be weaker in holding the prisms together when measured using bend tests on micro-cantilever samples machined from the region. Conclusion: The enamel in the transitional region adjacent to the demarcated defects in MIH has notable alterations in their prism sheaths which likely contribute to their lowered mechanical properties. © 2009 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/65953
ISSN
2015 Impact Factor: 3.109
2015 SCImago Journal Rankings: 1.029
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong Special Administrative Region, PR ChinaSEG-HKU06
University of Hong Kong10208242.16180.14500
Croucher Foundation
Funding Information:

This investigation was supported by a grant from the University Grants Committee (Project No. SEG-HKU06) of the Hong Kong Special Administrative Region, PR China, as well as a grant from the University of Hong Kong (Project No. 10208242.16180.14500). A.H.W. Ngan is grateful to the Croucher Foundation for support in the form of a Senior Research Fellowship.

References

 

DC FieldValueLanguage
dc.contributor.authorChan, YLen_HK
dc.contributor.authorNgan, AHWen_HK
dc.contributor.authorKing, NMen_HK
dc.date.accessioned2010-09-06T05:42:22Z-
dc.date.available2010-09-06T05:42:22Z-
dc.date.issued2010en_HK
dc.identifier.citationJournal Of Dentistry, 2010, v. 38 n. 3, p. 237-244en_HK
dc.identifier.issn0300-5712en_HK
dc.identifier.urihttp://hdl.handle.net/10722/65953-
dc.description.abstractObjectives: Failure of the enamel adjacent to the defects in teeth with molar incisor hypomineralization (MIH) limits the success rate of the restorations placed in these teeth and this frequently leads to their ultimate extraction. To understand the cause, a state-of-the-art combination of focused ion beam (FIB) and nanoindentation techniques was used to evaluate the fracture properties and microstructure of enamel from specific regions of two MIH teeth. Methods: Nanoindentation, bend tests on micro-cantilevers and transmission electron microscopy (TEM) were employed to compare the microstructure and mechanical properties of the unaffected, opaque and transitional region in two MIH teeth. Special attention was paid to the transitional region in all the experiments in an attempt to identify its role in affecting the overall integrity of the MIH teeth. Results: The enamel in the transitional region, despite its translucent appearance under the naked eye, was found, under TEM, to have prism sheaths that were significantly less mineralized than unaffected enamel and were proved to be weaker in holding the prisms together when measured using bend tests on micro-cantilever samples machined from the region. Conclusion: The enamel in the transitional region adjacent to the demarcated defects in MIH has notable alterations in their prism sheaths which likely contribute to their lowered mechanical properties. © 2009 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/jdenten_HK
dc.relation.ispartofJournal of Dentistryen_HK
dc.subjectEnamelen_HK
dc.subjectHypomineralizationen_HK
dc.subjectNanoindentationen_HK
dc.subjectTransmission electron microscopyen_HK
dc.subject.meshDental Enamel - pathology - ultrastructure-
dc.subject.meshDental Enamel Hypoplasia - pathology-
dc.subject.meshElastic Modulus-
dc.subject.meshIncisor - pathology-
dc.subject.meshMolar - pathology-
dc.titleDegraded prism sheaths in the transition region of hypomineralized teethen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0300-5712&volume=38&issue=3&spage=237&epage=244&date=2010&atitle=Degraded+prism+sheaths+in+the+transition+region+of+hypomineralized+teethen_HK
dc.identifier.emailNgan, AHW: hwngan@hkucc.hku.hken_HK
dc.identifier.emailKing, NM: hhdbknm@hkucc.hku.hken_HK
dc.identifier.authorityNgan, AHW=rp00225en_HK
dc.identifier.authorityKing, NM=rp00006en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jdent.2009.11.003en_HK
dc.identifier.pmid19941930-
dc.identifier.scopuseid_2-s2.0-76349122202en_HK
dc.identifier.hkuros193241en_HK
dc.identifier.hkuros168959-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-76349122202&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume38en_HK
dc.identifier.issue3en_HK
dc.identifier.spage237en_HK
dc.identifier.epage244en_HK
dc.identifier.isiWOS:000275576200009-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridChan, YL=8250546500en_HK
dc.identifier.scopusauthoridNgan, AHW=7006827202en_HK
dc.identifier.scopusauthoridKing, NM=7201762850en_HK
dc.identifier.citeulike6245597-

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